• This gyroscope board is a basic carrier/breakout board for the ST LISY300AL single-axis gyro, which measures rotational motion with a ±300°/s range.
• This board has a 3.3V regulator for easy integration with 5 V parts,
• includes a two-stage low-pass filter for noise reduction, and is smaller than competing products, all at a lower price.
• This single-axis gyro is essentially a carrier board or breakout board for the ST LISY300AL MEMS (micro-electro-mechanical systems) gyroscope; therefore careful reading of the LISY300AL datasheet (176k pdf) before using this product is recommended.
• The LISY300AL is a great IC, but its small, leadless package makes it difficult for the typical student or hobbyist to use.
• The device also operates at 2.7 V to 3.6 V, which can make interfacing difficult for microcontrollers operating at 5 V. This carrier board addresses both issues while keeping the overall size below half a square inch.

Features

• Integrated 3.3 V regulator means no extra parts are required for integration into 5 V circuitry.
• Measures rotation speeds from -300 degrees/second to +300 degrees/second.
• Optional power-down input; may be shorted to a neighboring ground pin if the low-power state is not needed.
• Optional embedded self-test input; this is connected to a pull-down resistor on the board to disable it by default.
• Two-stage low-pass filtered output to reduce high-frequency noise.
• Two mounting holes for sturdy connection to a robot chassis or project enclosure.
• Small size: 0.7" × 0.7".

How to Use the sensor

• The sensor measures rotation in the plane of the board, as indicated by the arrow on the board silkscreen.
• The schematic for the gyroscope carrier in images tab.
• The device can be powered directly through the Vdd/3.3 V pin using a supply that is within the LISY300AL’s acceptable power supply range of 2.7 V to 3.6 V. 
• the board can be powered by higher voltages, up to 16 V, using the VIN pin, which connects to a low-dropout 3.3 V regulator.
• In this configuration, the Vdd/3.3 V pin can serve as an output to be used as a reference voltage or power source for other low-power devices (up to around 50 mA, depending on the input voltage).
• The power down pin is not connected by default. If a low-power state is not required for your application, use a small piece of wire or solder to make a short between the power down pin and the ground pin next to it. To use the power down pin, your circuit must bring it up to Vdd (typically 3.3 V); in 5 V applications, this can be done by adding a pull-up resistor to the 3.3 V output.
• The self-test input is pulled low by default. To activate the self-test feature of the LISY300AL, drive the line to Vdd (the same pull-up trick as above can be used for 5 V applications).
• For 5 V microcontroller applications, the power down and self test lines should not be driven high. Instead, the microcontroller I/O pin can emulate an open-drain or open-collector output by alternating between low output and high-impedance (input) states. Put another way, if you are using a 5 V microcontroller, you should make your power down and self test I/O lines inputs and use pull-up to 3.3 V if you want them to be high. It is always safe for you to drive these lines low.
• The output is an RC-filtered analog voltage that ranges from 0 to Vdd; with no rotation, the output voltage is typically 1.65 V with Vdd set to 3.3 V. For 5 V applications, the outputs will range from 0 to 3.3 V. The 3.3 V output can be used as a reference for analog-to-digital converters to gain full resolution samples. Otherwise, your conversions will be limited to 66% of the full range (e.g. an 8-bit ADC will yield numbers from 0 to 168).